/* base class for all resample operations
 */

/*

	Copyright (C) 1991-2005 The National Gallery

	This library is free software; you can redistribute it and/or
	modify it under the terms of the GNU Lesser General Public
	License as published by the Free Software Foundation; either
	version 2.1 of the License, or (at your option) any later version.

	This library is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
	Lesser General Public License for more details.

	You should have received a copy of the GNU Lesser General Public
	License along with this library; if not, write to the Free Software
	Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	02110-1301  USA

 */

/*

	These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk

 */

#ifndef VIPS_PRESAMPLE_H
#define VIPS_PRESAMPLE_H

#ifdef __cplusplus
extern "C" {
#endif /*__cplusplus*/

#define VIPS_TYPE_RESAMPLE (vips_resample_get_type())
#define VIPS_RESAMPLE(obj) \
	(G_TYPE_CHECK_INSTANCE_CAST((obj), \
		VIPS_TYPE_RESAMPLE, VipsResample))
#define VIPS_RESAMPLE_CLASS(klass) \
	(G_TYPE_CHECK_CLASS_CAST((klass), \
		VIPS_TYPE_RESAMPLE, VipsResampleClass))
#define VIPS_IS_RESAMPLE(obj) \
	(G_TYPE_CHECK_INSTANCE_TYPE((obj), VIPS_TYPE_RESAMPLE))
#define VIPS_IS_RESAMPLE_CLASS(klass) \
	(G_TYPE_CHECK_CLASS_TYPE((klass), VIPS_TYPE_RESAMPLE))
#define VIPS_RESAMPLE_GET_CLASS(obj) \
	(G_TYPE_INSTANCE_GET_CLASS((obj), \
		VIPS_TYPE_RESAMPLE, VipsResampleClass))

typedef struct _VipsResample {
	VipsOperation parent_instance;

	VipsImage *in;
	VipsImage *out;

} VipsResample;

typedef struct _VipsResampleClass {
	VipsOperationClass parent_class;

} VipsResampleClass;

GType vips_resample_get_type(void);

/* The max size of the vector we use.
 */
#define MAX_POINT (2000)

int vips_reduce_get_points(VipsKernel kernel, double shrink);

void vips_reduceh_uchar_hwy(VipsPel *pout, VipsPel *pin,
	int n, int width, int bands,
	short *restrict cs[VIPS_TRANSFORM_SCALE + 1],
	double X, double hshrink);
void vips_reducev_uchar_hwy(VipsPel *pout, VipsPel *pin,
	int n, int ne, int lskip, const short *restrict k);

void vips_shrinkh_uchar_hwy(VipsPel *pout, VipsPel *pin,
	int width, int hshrink, int bands);
void vips_shrinkv_uchar_hwy(VipsPel *pout, VipsPel *pin,
	int ne, int vshrink, int lskip);

#ifdef __cplusplus
}
#endif /*__cplusplus*/

#endif /*VIPS_PRESAMPLE_H*/
